首页
登录
职称英语
Australia is【21】driest continent in this world. The evaporation rate of rain
Australia is【21】driest continent in this world. The evaporation rate of rain
游客
2024-08-13
45
管理
问题
Australia is【21】driest continent in this world. The evaporation rate of rainfall in Australia is【22】.
The reason for rapid drying-up of water and bare penetrating of the soil of rainfall is that the moisture is absorbed by.【23】
In sandy soils rainwater can【24】
Water is mainly pumped up for【25】
Natural springs are located in some parts【26】
Underground water supplies about 18% of the【27】
The dams store water for a variety of functions:
the rural irrigation【28】
the regulation【29】
the generation【30】 [br]
Good morning. This morning we are continuing our look at Australia and its natural problems. Actually dryness, or aridity, as it is generally called by geographers, is probably the most challenging of Australia’s natural problems and so it is very important in this course for you to have a good understanding of the subject. For Australia, water is a precious resource and its wise management is of the greatest importance.
As I have said, Australia is a dry continent, second only to Antarctica in its lack of rainfall. Long hours of hot sunshine and searing winds give Australia an extremely high rate of evaporation, far more than in most other countries. It is estimated that approximately 87% of Australia’s rainfall is lost through evaporation, compared with just over 60% in Europe and Africa and 48% in North America. You generally think of many parts of Australia standing water, that is dams, puddles and so forth, dry up rapidly and some rainfall barely penetrates the soil. The reason for this is that thirsty plants absorb the moisture.
Some parts of Australia are dry because rainwater seeps quickly through sandy soil and into the rock below. In parts of Australia this water, which seeps through the sandy soils collects underground to form underground lakes. Water from these subterranean lakes can be pumped to the surface and lapped and so used for various purposes above the ground. In fact, extensive underground water is too salty to be used for human consumption or for the irrigation of crops. However, most inland farmers do rely on this water for watering their animal and, where possible, to a lesser extent for irrigation.
Underground water can flow very large distances and can be kept in underground reservoirs for a very long time. Water from these underground bubbles to the surface as springs in some parts of the country, and there rare sources of permanent water were vital to early explorers of island Australia, and to other pioneers last century, who used the springs for survival. But in many places levels have fallen drastically through continuous use over the year. This has necessitated the pumping of the water to the surface. Remarkably, underground water sources in Australia supply about 18% of total water consumption. So you can see it is quite an important source of water in this dry land.
So most of the consumption of water in Australia comes from water which is kept above ground. More than 300 dams regulate river flows around the country. The dams store water for a variety of function, the rural irrigation of crops, without which many productive areas of the country would not be able to be farmed ; the regulation of flooding, a serious problem which will be dealt with later in the course; and last but not least, the harnessing of the force of gravity for the generation of electricity. That is all we have for this morning, but you will be able to do further study on this important area in the interested, please come up to the desk and take a copy.
选项
答案
of the country
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3717727.html
相关试题推荐
Australiais【21】driestcontinentinthisworld.Theevaporationrateofrain
Australiais【21】driestcontinentinthisworld.Theevaporationrateofrain
Australiais【21】driestcontinentinthisworld.Theevaporationrateofrain
Australiais【21】driestcontinentinthisworld.Theevaporationrateofrain
Australiais【21】driestcontinentinthisworld.Theevaporationrateofrain
Australiais【21】driestcontinentinthisworld.Theevaporationrateofrain
Australiais【21】driestcontinentinthisworld.Theevaporationrateofrain
Australiaisthe______largestcountryintheworld.A、fourthB、fifthC、sixthD、
WhicharethenationalflagandthecoatofarmsofAustralia?[img]2012q2/ct_ey
Australiaisthe______largestcountryintheworld.A、fourthB、fifthC、sixthD、se
随机试题
Thispoliticaldilemma______him,changinghimfromacharming,smartandsocia
Theyarediscussingthingsandpersons______occupyanimportantpositioninth
灰土地基适用于加固深()m厚的软弱土、湿陷性黄土、杂填土等,还可用作结构的辅助
债务人或交易对手未能履行合同规定的义务或信用质量发生变化,影响金融产品价值,从而
债券买卖交易中有公开报价、对话报价、双边报价和小额报价四种报价方式,()属于询
人在每一瞬间,将心理活动选择了某些对象而忽略了另一些对象。这一特点指的是注意的(
下列金融衍生工具中,属于交易所交易的衍生工具有()。A:金融远期合约B:股票期
案例四: 一般资料:郭某,女性,25岁,国企职员。 案例介绍:近两个月来,郭
关于监理组织常用的四种组织结构形式的说法中,正确的是()。A.直线制监理组
B
最新回复
(
0
)